Hi Ralph,Maybe I am wrong in viewing these watches but I guess the left one does not have a dial with "patina" but the dial is covered with a soft-green substance : zinc-sulphide (ZnS). This substance was applied to make the watch : "glowing in the dark". This Kriegsmarine (KM) watch was present at the German submarines during W.W. II. Unlike many collectors think, the green covering of the dial is not radioactive. I measured this, by using extremely sensitive Geiger counters and I wrote an article about it. The greenish dial will light up if normal white light or ultraviolet light is shed upon it. The German submarines (U-Boote) had an uv-light source on board. This was switched on for a few seconds. As a result the dial started to glow , but extincted about 30 seconds later. Enough time to read the exact time. And the exact time was crucial for correct navigation.Kind regards,Adrian,(alwaysiwc).

Hi Adrian,Many WWII era aircraft used the same principe of shining UV light into instruments coated with Zinc Sulphide paint. In these cases, the numbers and the hands were coated, not the dials, as is the case in this particular KM deck watch.

Dear Roman,Just adding your KM watch with ZnS dial is not just that!Showing an authentic KM watch that landed in Moscow is not just that!It is very special to IWC Forumers like me , to see that IWC watches are collected in Russia and that you as an owner found the way to our IWC Forum. Congratulations with this watch.Adrian,(alwaysiwc).